We borrowed a DeLongi "all in one" portable unit from a friend recently. Apparently (although this is hearsay and may be inaccurate) it was bought here about 3 years ago and cost around 1700 euros. The same supplier still stocks them. If these are available it's likely that other makes will be too. So yes, you can get them here, but probably at a far higher cost that the one you saw.
Out of interest, we've now had 2 wall mounted air con/heater units fitted. Total cost including installation was under 1000 euros and they heat/cool our approx 75sqm of floorspace (on 3 levels) no problem.
Whilst not dehumidifiers, the heat is dry so helps stave off the damp, and they have the benefits of not taking up space (the one we borrowed was, as you described, about the size of a small fridge), not having pipes that have to be hung out of windows, and not needing regular checks on the water canisters.
Hope this helps.